Can I call my 1st cousin's son nephew?

Answer 1

Your nephew's sister is your niece. Her son is your great nephew.

Your nephew's sister might not be related to you if she is the child of a second marriage in which your sibling was not one of the parents. In that case, she is your nephew's half-sister and her son is not related to you either.

Answer 2

Everyone is a second cousin to someone, but your niece's son is your great nephew, not your second cousin.

Your niece's son and your grandchild are second cousins to each other.

Answer 3

No. Your first cousin and your nephew are first cousins once removed to each other. Your nephew (or your child) and the child of your first cousin are second cousins to each other.

Answer 4

Of course, just a different kind of cousin. Your first cousin's son is your first cousin, once removed.

Answer 5

Your niece's son is your great nephew.